21428608343 has 8 divisors (see below), whose sum is σ = 21554382960. Its totient is φ = 21303162880.

The previous prime is 21428608337. The next prime is 21428608373. The reversal of 21428608343 is 34380682412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21428608343 - 2⁸ = 21428608087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21428608343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21428608373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48908 + ... + 212718.

It is an arithmetic number, because the mean of its divisors is an integer number (2694297870).

Almost surely, 2^21428608343 is an apocalyptic number.

21428608343 is a deficient number, since it is larger than the sum of its proper divisors (125774617).

21428608343 is a wasteful number, since it uses less digits than its factorization.

21428608343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164577.

The product of its (nonzero) digits is 221184, while the sum is 41.

The spelling of 21428608343 in words is "twenty-one billion, four hundred twenty-eight million, six hundred eight thousand, three hundred forty-three".